I was entering some points directly from the map, adding descriptions etc. On clicking the 'Add Point' icon for the fifth point, PathAway closed and I found myself back on the 'Today' screen. On re-entering PathAway my points were displayed but no map. On further investigation I found the entire contents of \Storage Card\PathAway had disappeared, including all my maps and the secondary PathAway database!

Apart from that (!) 4.00.42 seems to be a great improvement over previous versions especially with regard to menu/item selection response.

Just wanted to say that similar thing happened to me also. One day the memory card that contained maps was empty. I had not removed the SD card from PDA nor used any other programs other than PathAway. I put the "empty" SD card into card reader connected to a PC and indeed no files were visible but, free space was reported as there was something on the card, so probably the disk's file allocation table was garbaged.